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ADPD188BI Recommended for New Designs
The ADPD188BI is a complete photometric system for smoke detection using optical dual wavelength technology. The module integrates a highly efficient photometric...
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ADPD188BI on Analog.com

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ILED Peak calculation

		
	
				

			

									
					    AarohLabs
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 9, 2025 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  ADPD188BI  
    
    		        		    		    
    
		    		    
		    			
    
			    
    The ADPD188BI datasheet provide equation for ILED Peak is as follows.  (Page 48, Rev. B)
    

    LED1 PEAK  = LED1 COARSE × LED1 FINE × LED1 SCAL  
    

    

    The Circuit Note CN0537 Page provide the same equation as follows. (CN0537, Page 3)
    

    ILEDx_PK = ILEDx(COURSE) + ILEDx(FINE) + ILEDx(SCALE)
    

    

    Which one is correct?
    

    

    
			
    
			
									
		                             
                        

    
    
                                            
                 Datasheet/Specs
                
                                                    
                 Optical Sensing Technology
                
                                                    
                 Optical Mixed Signal Devices
                
                                                    
                 ADPD188BI
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Feb 6, 2025 10:09 AM
            
            
						
			            		
      
		
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      The LED peak is best understood from the ADPD188BI datasheet table.  The values for "peak", "Coase" and "scale are defined in the LED register table.  Note that these are not direct register values but are computations derived from the value.  These weights and factors are based on average measured results from a number of parts.  Because their is a distribution, this LED peak value should be taken as a "typical" result.  Supply voltage and other constraints will also change this value.
      

       
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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